Timeline: show white overlay till page being reloaded paints

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 4257 matching lines @@
     } else {
         m_rootGraphicsLayer = nullptr;
         m_visualViewportContainerLayer = nullptr;
         m_rootLayer = nullptr;
         // This means that we're transitioning to a new page. Suppress
         // commits until Blink generates invalidations so we don't
         // attempt to paint too early in the next page load.
         m_layerTreeView->setDeferCommits(true);
         m_layerTreeView->clearRootLayer();
         m_layerTreeView->clearViewportLayers();
+        if (WebDevToolsAgentImpl* devTools = mainFrameDevToolsAgentImpl())
+            devTools->rootLayerCleared();
     }
 }
 
 void WebViewImpl::invalidateRect(const IntRect& rect)
 {
     if (m_layerTreeView) {
         updateLayerTreeViewport();
     } else if (m_client) {
         // This is only for WebViewPlugin.
         m_client->widgetClient()->didInvalidateRect(rect);
@@ skipping 312 matching lines @@
         return nullptr;
     return focusedFrame;
 }
 
 LocalFrame* WebViewImpl::focusedLocalFrameAvailableForIme() const
 {
     return m_imeAcceptEvents ? focusedLocalFrameInWidget() : nullptr;
 }
 
 } // namespace blink